The problem
A dead port may be disabled, damaged, misconfigured or affected by a bad cable/device.
Recommended approach
Isolate the fault by moving a known-good device and cable through the suspected port.
Step-by-step checklist
- Check port status and configuration.
- Test with a known-good patch cable.
- Test a known-good endpoint.
- Check VLAN assignment.
- Replace or reconfigure the port only after isolation.
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